推荐回答（3个）
在暗光环境下，KR比KX的对焦速度要快30~50%还是挺明显的，这里是说不开对焦辅助灯的情况。详情你可以上网搜搜KR和KX的对焦速度对比视频，有人专程录了一系列。至于对焦辅助灯我觉得KX更好，因为KX是用内置闪光灯做对焦辅助灯的。
如果是对着电视机，两台机的对焦速度都可以很快。因为电视机的亮度很高，哪怕四处一片漆黑，但是对着屏幕之类的发光物体对焦，其实与白天户外差不多。演唱会也一样，因为灯光是聚在演唱者身上的，所以光线会足够好。而所谓的暗光环境，是例如晚上的街道上对着一个人对焦，或者在室内并不明亮的灯光下对着不发光的物体对焦。当然，虽然对焦速度有差别，但两台机都能够正常对焦。
我觉得两者最主要的差别是对焦点显示。KR可以在眼睛不离开取景器的时候设置对焦点位置，而用KX就必须离开取景器看屏幕。当然就算是正常情况，KR的对焦速度都要比KX快。
A16是腾龙的牛头。F2.8恒定大光圈对于变焦镜头来说，足够明亮。对焦问题不大。甚至在室内拍摄或者暗光拍摄，A16表现出色。当然就这么用可能会体会不出来，但只要一和18-55套头比，就能比出来了，要好很多。
接上，与60D相比，画质断然要比60D套机好。在单反系统中，影响成像的因素主要决定于镜头。虽然是副厂，但怎么说也是恒定光圈牛头，要比18-55这种最狗的狗头好得多。所以如果你不是图60D的操控性，就别想60D了。
总而言之，如果预算够，最好还是KR。
不过就算预算不够只能上KX，那也不会让你失望的。
…………还有，楼上北江一水人其实是不懂的吧？不知道KX可以通过闪光灯辅助对焦？还有A16怎么可能是手动头？
KX的对焦辅助灯是用闪光灯来辅助的，不是很好。KR对焦有专门的对焦灯 ，如果是在夜晚的外面拍摄，KR对焦一定是好过KX的。 在KTV里的投影 或者是家里的电视 都直接对焦就行了，因为它们都是光源。
兄弟，KR和kx的对焦能力其实差不多，当然KR是好点，尤其是在黑的地方，因为KR有对焦辅助灯。所以我觉得买kr好点。ps，A16是手动头来的。如果是用来演唱会这种场面的，其实也发挥不大。
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